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The HEVC is one of the most recent video coding standards, developed in order to face upcoming challenges, due to higher video quality and resolution. One of the HEVC components is the entropy encoder, which consists only of the Context Adaptive Binary Arithmetic Coding (CABAC) algorithm. The CABAC algorithm imposes some severe difficulties in order to achieve increasing throughput, due to the high...
LDPC codes are a family of error correcting codes used in most modern digital communication standards even in future 3GPP 5G standard. Thanks to their high processing power and their parallelization capabilities, prevailing multi-core and many-core devices facilitate real-time implementations of digital communication systems, which were previously implemented on dedicated hardware targets. Through...
When a standard TCP implementation using the minimum retransmission timeout (RTOmin) of 200 ms is used in distributed file systems in data centers, a well-known throughput degradation called TCP Incast occurs, because 200 ms is too large as an RTOmin in data centers. In order to avoid TCP Incast, a TCP implementation using a much smaller RTOmin attained by a fine-grained kernel timer is proposed....
ECN thresholds have limited operational range and very strict scope. Lower thresholds exacerbate the queue underflow while higher thresholds increase the queueing delays. In this paper, an Adaptive ECN (A-ECN) marking scheme is proposed to enhance the performance of ECN. A-ECN can adaptively adjust ECN marking thresholds in different scenarios to achieve good generality. Therefore, network operators...
The computer modeling system of industrial extruders with adjustable configuration has been developed allowing solving control tasks of multi-assortment polymeric film quality under change-over of production lines on new assignments and under product manufacture. The system includes module for extruder mark choice, module for extruder configuration design, module for calculation of geometrical parameters...
When encrypting a single file in the CBC mode of 3DES, there is a feedback path which brings data dependency. Even much more resources are given, it does not help matters to increase the throughput of 3DES. In this paper, we propose a logic simplifying method to accelerate the throughput in the CBC mode. In the datapath, 15 levels of XORs from the critical path can be moved to the non-critical path...
ZigBee is a widely used wireless technology in low-power and short-range scenarios such as Internet of Things (IoT), sensor networks, and industrial wireless networks. However, the standard ZigBee supports only one data rate, 250Kbps, which thoroughly limits ZigBee's efficiency in dynamic wireless channels. In this paper, we propose Mrs.Z, a novel physical layer design to enable multi-rate selection...
This study concerns about Beamforming techniques in a Multi-User Indoor environment at mm-Wave E-band. Directional mm-Wave measurement data are used as reliable radio channel reference for the study and, furthermore, are checked against advanced Ray Tracing simulations. The main goal is to assess the quality of Spatial Division Multiple Access using three different Beamforming schemes in order to...
With an abundance of wireless devices saturating daily life, the ability of devices to coexist among other devices is of increasing interest. While standards are starting to incorporate coexistence measurements, the robustness of coexistence measurement methods is still an area of active research. To demonstrate the robustness of the multiple test methods, a series of measurements needs to be conducted...
Efficiency of MAC (media access control) is one of important issues of power line communication (PLC). There exists efficiency problem in current CSMA/CA (Carrier Sense Multiple Access with Collision Avoidance) mechanism of large-scale PLC network. Aimed to solve this problem, a Cluster and Probability Competition Based MAC (CP-MAC) mechanism is presented to improve the MAC efficiency, in which the...
We propose an optimal Physical Layer Convergence Procedure Protocol Data Unit (PPDU) duration algorithm that divides a long data stream into two portions among consecutive groups based on the average PPDU duration of the Very High Throughput (VHT) group. The proposed solution considers all Wireless Local Area Network (WLAN) parameters and satisfies requirements of the VHT Multi-User Multiple Input...
Bluetooth Low Energy (BLE), also known as Blue-tooth Smart, is part of the Bluetooth 4.0 Core specifications, introduced in June 2010 by the Bluetooth Special Interest Group (SIG). BLE is designed as a radio standard that minimizes power consumption and it is particularly suited for low cost, low bandwidth, low power, and low complexity applications. These aspects of the standard represent the reasons...
G-TCP represents novel transport protocol designed to be used by Next Generation Networks. It engages famous Fibonacci sequence to calculate congestion window size when the protocol operates in congestion avoidance phase. Modification of window decrease parameter is introduced in order to improve protocol behaviour in high and low speed networks.
Programmable Logic Controllers (PLCs) are specialized computing systems for the control and monitoring of distributed industrial devices. Aiming for a highly connected industrial Internet-of-Things (IoT) ecosystem, PLCopen OPC Unified Architecture (UA) specification has been released. This paper presents the implementation and evaluation of a PLCopen OPC-UA software component for industrial control...
This paper proposes the implementation of the Advance Encryption Standard (AES) algorithm on Apple iPhone7. We extend the standard AES-128 algorithm to support the block size of 512 bits (AES-512). There are 4 steps in the encryption process: SubBytes, ShiftRows, MixColumns and Add-round key. The comparison between original AES-128 and the new AES-512 using 128, 192, 256, 512, 102 4 bits key size...
Today's data centers networks are commonly featured with the richness paths. This aim to improve the network performance with multipath connections and increases reliable system connection for the cables get cut, the failures of switches or routers. However, the common problem of multipath connection is suffered from the difference path conditions in term of speed and delay. In this paper based on...
Wireless Mesh Networks (WMNs) are gaining popularity due to the features provided, especially the low cost and self-configuration ability. In WMNs, the data traffic is transmitted through intermediate nodes and a number of packets are dropped during the transmission due to various reasons. One significant reason is the limitation of network resources such as bandwidth and buffer size. Because of these...
In recent years, advances in wireless local area network (WLAN) systems have led to large increases in the transmission speed. The IEEE 802.11ac standard allows for very high transmissions by using multi-user multiple input multiple output (MU-MIMO) techniques in the physical (PHY) layer. However, the transmission efficiency is decreased by the channel state information (CSI) estimation algorithm...
Adaptive streaming improves user-perceived quality by altering the streaming bitrate depending on network conditions, trading reduced video bitrates for reduced stall times. Existing adaptation approaches, e.g., rate-based, buffer-based, either rely heavily on accurate bandwidth prediction or can be overly-conservative about video bitrates. In this work, we propose a reinforcement learning approach...
This work analyses the actual throughput of the Discrete Sine Transform (DST) stage in a realistic HEVC encoder, which executes the rate-distortion optimization algorithm to achieve high compression quality. Then, a low complexity DST factorization, where all the integer multiplications are substituted with add-and-shift operations, is exploited to design an efficient 1D-DST core. The proposed 1D-DST...
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